Clerk.js allows you to write custom Javascript functions that add new functionality to the Designs.

TemplateFormatters should be inserted as a configuration for Clerk.js, in the tracking-script that is inserted on all pages.

An example can be seen below:

<script type="text/javascript">
  window.clerkAsyncInit = function() {
      Clerk.config({
          key: 'insert_key',
          templateFormatters: {
             log_price: function(price) {
                console.log(price);
             }
      });
  };
  (function(){
      var e = document.createElement('script'); e.type='text/javascript'; e.async = true;
      e.src = document.location.protocol + '//api.clerk.io/static/clerk.js';
      var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(e, s);
  })();
</script>


You can write any number of TemplateFormatters, separated by comma:

templateFormatters: {
   log_price: function(price) {
      console.log(price);
   },
   calculate_discount: function(price,special_price) {
      return price-special_price;
   },
   substring: function(text) {
      var short_string = text.substring(0,20);
      return short_string;
   }          
}

After creating your TemplateFormatters, you can use them in your Designs using this syntax:

{{ formatter attribute }} {{ formatter attribute1 attribute2 }}

This effectively allows you to create any functionality in your Designs that you require.

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